Trying to move away from MemoryRealm to using JDBCRealm.

This is what I have done:
1. Create table called "users" with two columns: "user_name" and "user_pass"
2. Create table called "roles" with one column: "role_name"
3. Create table called "user_roles" with two columns: "user_name" and "role_name"
4. Comment out this part:
5. Enable this part:

But it doesn't seem to work. I look at Tomcat log and it shows me this.